Movement of air caused by temperature or pressure differences is wind . Where there are differences of pressure between two places, a pressure gradient exists, across which air moves: from the high pressure region to the low pressure region.
What causes the movement of air and water?
Lighter (less dense), warm material rises while heavier (more dense) cool material sinks. It is this movement that creates circulation patterns known as convection currents in the atmosphere, in water, and in the mantle of Earth. In the atmosphere, as air warms it rises, allowing cooler air to flow in underneath.
What causes the movement of the wind?
Wind is the movement of air caused by the uneven heating of the Earth by the sun . ... Warm equatorial air rises higher into the atmosphere and migrates toward the poles. This is a low-pressure system. At the same time, cooler, denser air moves over Earth’s surface toward the Equator to replace the heated air.
What are the two types of air movement?
Explanation: Movement of air due to differences in temperature between two locations is known as convection or advection . Convection is the term commonly applied to vertical movement of air, whilst advection is used in the context of horizontal displacement of air.
What causes the movement of air Class 9?
The movement of air is mainly caused by the differences in pressure and temperature . Warm air is lighter and it rises upwards, meanwhile, cold air is denser and hence it moves down to replace the warm air. This phenomenon creates wind.
What is called movement of air?
Movement of air caused by temperature or pressure differences is wind .
How does air move in general?
Air in the atmosphere moves around the world in a pattern called global atmospheric circulation. ... When the air cools, it drops back to the ground, flows back towards the Equator, and warm again . The, now, warmed air rises again, and the pattern repeats. This pattern, known as convection, happens on a global scale.
What are the factors that affect the movement of air in places?
There are 5 major factors affecting global air circulation : – uneven heating of earth’s surface, seasonal changes in temperature and precipitation , rotating of earth on its axis, properties of air and water and long term variation in the amount of solar energy striking the earth.
What is vertical movement of air called?
The vertical movement of air is called air current . Temperature differences can cause air currents because warmer air is less dense than cooler air, causing the warmer air to appear ‘lighter’. Air currents can be caused by differences in temperature, pressure, or impurity concentration.
What is the role of air in water cycle?
Air and the Water Cycle
Air is important because it helps water move between these states in a process scientists call the water cycle. Heated by the sun, surface water evaporates into the air and becomes water vapor. ... Clouds return water to the ground in the form of rain, sleet or snow.
What are the 4 types of winds?
Ans. The different types of winds on earth are planetary winds, trade winds, periodic winds, local winds, and westerlies . 2.
What will be the movement of wind during night?
Land breeze , a local wind system characterized by a flow from land to water late at night. ... The land breeze is typically shallower than the sea breeze since the cooling of the atmosphere over land is confined to a shallower layer at night than the heating of the air during the day.
What if there was no wind?
Absent a gentle breeze or mighty gale to circulate both warm and cold weather around the Earth, the planet would become a land of extremes . Areas around the Equator would become intensely hot and the poles would freeze solid. Whole ecosystems would change, and some would completely disappear.
What is the most important reason for air movement?
The movement of air through Earth’s — or any planet’s — atmosphere is called wind, and the main cause of Earth’s winds is uneven heating by the sun . This uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.
How does air move in a room?
Air moves due to a difference of air pressure which can be caused by different temperatures . ... This means if you were in a room and the left side had high air pressure, and the right side had low air pressure, then air would want to move from the left side to the right side!
How does air move through a fan?
The fan works by pulling air in and then making it move faster . The air flow behind the fan is slow moving and wide (you can see the arrows behind the fan coming from above and below the fan blades) whereas the air flow in front of the fan is fast moving and narrow (which follows from the conservation of mass flow.
